focusin&focusout 與click事件衝突問題

具體問題見：https://stackoverflow.com/questions/53773661/not-able-to-detect-button-press-when-using-focusout-and-focusin-along-with-clickjquery 遇到的問題是用jquery on監聽element ui dropdown menu裏面的button click事件，作一

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